Expansion and/or contraction joint assembly



'EXPANS-ION AND/OR CONTRACTION JOINT ASSEMBLY Filed Dec. 12;. 1946 Hts(Ittorneg April 1949- A. E. BRICKMAN 2,467,806

EXPANSION AND/OR CONTRACTiON JOINT ASSEMBLY Filed Dec. 12, 1945 3sheets-sheet 2 {a &

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. QQ w 3nventor v/1/ m E. Bub/(man April 19, c EXPANSION AND/ORCONTRACTION JOINT ASSEMBLY Filed D60. l2, 1946 3 Sheets-Sheet 3 3nventorA/ci/z 5 Br/ c/rma Y H u (Ittorne g Patented Apr. 19, 1949 UNITED STATES"PATENT OFFICE EXPANSION AND/ OR CONTRACTION JOINT ASSEMBLY AlanBrickman, 'worcester, Mass, assignor to The American Steel and WireCompany of New Jersey, a corporation of New Jersey Application December12, 1946, "Serial No. 715,716

'2 Claims. (01. 94-8.)

This invention relates to an expansion and/or contraction joint assemblyand more particularly to such a joint used with a center parting strip.Transverse contraction joints are assembled and pinned to the sub-gradebetween the formsahead of the mixing, spreading and finishing machine.The wet concrete is=dumped within the forms and the spreader machineforces it forward toward the transverse jointsiln some cases it isnecessary to use bulkhead plates to prevent the load carrying dowels inthe joint assembly from moving out of parallelism with one another.During subsequent removal-of *these bulkheads the concrete around thejoints may be damaged and it is therefore desirable to eliminate theiruse. With some types of joints usedat present it is necessary to useconnecting wires across the :slabseparation which takes place when thepavement contracts, the Wires having the disadvantage of restrainingthis action until they finally break. It is difiicult in many instancesto center the dowel members with relation to the parting plate so thatmore of the dowel will be on one side of the joint than on the other,this decreasing the efiiciency of the transload function of the joint.Surface water tends to seep through the joint into the sub-grade, thisresulting in objectionable pumping of the water as traffic passes overthe joint. Ther is also :danger of'water from the sub-grade infiltratinginto the joint and freezing .orotherwise damaging the joint. Ordinarilyonly onehalf of the road width is poured at one timeand separatetransverse joint assemblies are used for each half. With joints used atpresent there is danger that "the jjointon one side of th road will notline up with that on the other.

It is an object of my invention to provide a joint which can withstandthe pressure of the wet concrete without the use of bulkheads or tiewires.

Another .object is to provide a joint parting member having means forexcluding sub-grade infiltration and surface water seepage.

.Still another object is to provide improved means of centering thejoint parting member in relation to'the dowel rod.

A still further object is "to provide means for maintaining the jointstraight for the full width of the road.

These and other objects will be more apparent after referring to thefollowing specification and attached drawings, in which:

Figure l is a perspective view of my invention;

Figure 2 is a view of a detail;

on which the contraction joint assembly is supported. A plurality ofload supporting :dowels l are arranged in a manner to extend through aparting plate 5 between concrete slabs ,8 and 140.

The means .for supporting the dowels 4 are the same on each side of aparting plate 5 and consists of a said plate angle I2 extendinglongitudinally of the parting plate 6 and a spacer rod l l parallel tothe angle l2, the angle I2 and rod it being connected by a vertical rod16 at each of the dowel rods '4. The top part of the rod 16 extends awayfrom the parting strip '6 and is arranged in the form of a helical coilis having a comparatively long pitch and a radial bond 20 at its outerend. The internal diameter of the coil 18 is slightly less than that ofthe dowel rod t to provide a frictional grip thereon. The lower end ofthe rod It is bent and welded to the angle l2 while the spacer rod 14 iswelded to the rod is in a position to help support the dowel rod 5.Openings 22 are provided in the angle 12 to receivevspikes 24.

he'parting plate .6 is of inverted T-shape with its lower edge havinga'return bond .25 to provide .a centered foot. The return bend 26 isspaced from the top portion 28 of the foot to provid -a slot 339 forhousing a non-deteriorating mastic board 32 whichacts asa sealing memberto prevent infiltration of water, sand orother material. The top edge ofthe parting plates is formed into a bead 34 having an opening 36therethrough which is of suiiicient size to receive a wire 38. Midway ofits height the parting plate ii is provided with spaced apart aperturesdB for receiving the dowel rods 4. A keyhole aperture @215 provided onopposite sides of each opening 40. At least part of therods l hasawasher M welded or otherwise securely fastened thereto at the centerthereof, the Washer having shoulder head rivets 46 Welded thereto inspaced apart relationship.

In assembling the joint assembly the mastic board 32 is forced into theslot 30. An angle I2 with its associated structure is arranged on eachside of the parting plate 6 and spaced therefrom.

The dowels 4 are inserted through the openings 40 in the parting plate 6a short distance into the helical coils l8 and are turned until theirends abut against the stops 2D. The dowels with the washers 44 weldedthereto are turned until the position of the rivets 46 corresponds withkeyhole apertures 42. The rivet heads are inserted through the largepart of the apertures with the washer in close engagement with the plate6, it being understood that the heads of the rivets 46 are spaced fromthe washers 44 a sufficient distance to permit the plate 6 to bearranged therebetween. The dowels 4 are then turned so that the rivetheads are over the small part of the slots 42, thus locking the dowelsin place. This entire assembly is then carried into position between theforms and pinned to the sub-grade by driving the spikes 24 through theopenings 22. It will be understood that the dowels 4 are painted andgreased to permit their movement in the concrete sockets formedtherearound.

Ordinarily the parting plate 6 extends only across one-half the width ofthe road and since the concrete is poured separately on the two sides ofthe road, the joint will not extend in a single plane across the fullwidth of the road. In order to form a joint in a single plane the pin 38is inserted into the parting strip 6 on one side of the rod and a secondparting strip is moved into abutting relationship with the first partingstrip and the pin 38 is inserted into the opening 36 of the secondparting strip, thus forming a male and female joint between the adjacentparting plates. The concrete is then poured forming slabs 8 and [0. Theedges of the slabs 8 and I above the parting plate 6 are tooled andfilled with a mastic sealing material 48. The mastic board 32 preventsinfiltration from the surface and the sub-grade.

If desired, one or both of the outboard supports for the dowels 4 may beomitted with this construction since the connection between the centerplate 6 and the dowels 4 is such that the dowels are supported as wellas centered therein.

A modified connection between the dowels 4 and plate 6 is shown inFigures 5 to 7. In this connection the washer 44' is provided with apair of spring lugs 46' in place of the button head rivets 48. Theselugs are received in the slots 42' in the plates 6 in the same manner asthe rivets 46 are received in the slots 42.

In some instances it is desired to use a sleeve 54 around the dowel 4 inthe contraction joint. This sleeve 54 is ripped within the helical coill8 as shown in Figure 4. It is also contemplated to use the joint as anexpansion joint as shown in Figure 4. In this case a joint filler 56made of a compressible board material such as cork, redwood, impregnatedfelt, cornstalks, or the like, is inserted between the slabs 8 and 10.The parting strip 6 is not used, but a steel channel plate 58 extendingthe length of the joint is secured to the joint filler by a series oftie clips 60, thus making the joint rigid. The left hand end of dowels 4are coated to prevent them bonding with the concrete of the slab so thatthe dowels move with respect to the slab as the concree expands andcontracts. The plate 58 is provided with openings 46 and 42' for each ofthe dowels in the same manner as shown for parting plate 6 in Figure 5.The lugs 46' on the washer 44' are received in the openings 42' tofasten the dowel 4 to the plate 58. The outboard supports for the dowels4 are essentially the same as that described in Figure 1, The sleeve 54is gripped within the helical coil 18 and is provided with acompressible filler 62 which is compressed by the movement of thepavement as it expands.

It is necessary to pin the joint assembly to the sub-grade to prevent itfrom shifting under the fiow of the wet concrete. In the joint shown inFigure 4, round rod stakes 64 are used for this purpose, the stakespassing through holes 66 in washers 68 which are spot-welded to theflanges of the channel plate 58. The stakes 64 are provided with pressedears 10 on diametrically opposite sides thereof close to the uppermostend thereof. The position of these ears is such that the stake 64 isdriven into the sub-grade a substantial distance before the ears 10 comein contact with the upper washer 68. Further driving after the earscontact the upper washer tends to draw the joint assembly into closerassociation with the subgrade.

While several embodiments of my invention have been shown and described,it will be apparent that other adaptations and modifications may be madewithout departing from the scope of the followin claims.

I claim:

1. A transload device for transferring loads between adjacent slabscomprising a vertical plate, said plate having an opening therethrough,a dowel passing through said opening, said plate having a pair of spacedapart elongated apertures therein adjacent said opening, a washerfastened to said dowel midway of its length, and a pair of projectionsfixed to said washer, one projecting into each of said apertures to lockthe dowel in place on said plate when the dowel is rotated about itsaxis.

2. A transload device for transferring loads between adjacent slabscomprising a vertical plate, said plate having an opening therethrough,a dowel passing through said opening, said plate having an elongatedaperture therein adjacent said opening, a washer fastened to said dowelmidway of its length, and a projection fixed to said washer andextending into said aperture to lock the dowel in place on said platewhen the dowel is rotated about its axis.

ALAN E. BRICKMAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,509,860 Cannady Sept. 30, 19241,921,081 Heltzel Aug. 8, 1933 2,062,654 Jacobson et a1 Dec. 1, 19362,119,355 Robertson May 31, 1938 2,167,199 Carm'e July 25, 19392,319,713 Williams May 18, 1943 Certificate of Correction Patent No.2,467,806. April 19, 1949.

ALAN E. BRIOKMAN It is hereby certified that errors appear in theprinted specification of the above numbered patent requiring correctionas follows:

Column 2, line 17, for the Word said read sand; column 3, line 66, forconcree read concrete;

and that the said Letters Patent should be read with these correctionstherein that the same may conform to the record of the case in thePatent Oflice.

Signed and sealed this 20th day of September, A. D. 1949.

JOE E. DANIELS,

Assistant Commissioner of Patents.

